/*
 * Copyright 2015-present Open Networking Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.onosproject.store.host.impl;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.onlab.packet.IpAddress;
import org.onlab.packet.MacAddress;
import org.onosproject.net.Host;
import org.onosproject.net.HostId;
import org.onosproject.net.HostLocation;
import org.onosproject.net.host.DefaultHostDescription;
import org.onosproject.net.host.HostDescription;
import org.onosproject.net.provider.ProviderId;
import org.onosproject.store.service.TestStorageService;

import com.google.common.collect.Sets;

import java.util.HashSet;
import java.util.Set;

import static junit.framework.TestCase.assertTrue;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;

/**
 * Tests for the ECHostStore.
 */
public class DistributedHostStoreTest {

    private DistributedHostStore ecXHostStore;

    private static final HostId HOSTID = HostId.hostId(MacAddress.valueOf("1a:1a:1a:1a:1a:1a"));
    private static final HostId HOSTID1 = HostId.hostId(MacAddress.valueOf("1a:1a:1a:1a:1a:1b"));

    private static final IpAddress IP1 = IpAddress.valueOf("10.2.0.2");
    private static final IpAddress IP2 = IpAddress.valueOf("10.2.0.3");

    private static final ProviderId PID = new ProviderId("of", "foo");
    private static final ProviderId PID2 = new ProviderId("of", "foo2");

    private static final HostDescription HOST_LEARNT =
            createHostDesc(HOSTID, Sets.newHashSet(IP1), false);
    private static final HostDescription HOST_CONFIGURED =
            createHostDesc(HOSTID, Sets.newHashSet(IP1), true);

    @Before
    public void setUp() {
        ecXHostStore = new DistributedHostStore();

        ecXHostStore.storageService = new TestStorageService();
        ecXHostStore.activate();
    }

    @After
    public void tearDown() {
        ecXHostStore.deactivate();
    }

    /**
     * Tests the removeIp method call.
     */
    @Test
    public void testRemoveIp() {
        Set<IpAddress> ips = new HashSet<>();
        ips.add(IP1);
        ips.add(IP2);

        HostDescription description = createHostDesc(HOSTID, ips);
        ecXHostStore.createOrUpdateHost(PID, HOSTID, description, false);
        ecXHostStore.removeIp(HOSTID, IP1);
        Host host = ecXHostStore.getHost(HOSTID);

        assertFalse(host.ipAddresses().contains(IP1));
        assertTrue(host.ipAddresses().contains(IP2));
    }

    @Test
    public void testAddHostByIp() {
        Set<IpAddress> ips = new HashSet<>();
        ips.add(IP1);
        ips.add(IP2);

        HostDescription description = createHostDesc(HOSTID, ips);
        ecXHostStore.createOrUpdateHost(PID, HOSTID, description, false);

        Set<Host> hosts = ecXHostStore.getHosts(IP1);

        assertFalse(hosts.size() > 1);
        assertTrue(hosts.size() == 1);

        HostDescription description1 = createHostDesc(HOSTID1, Sets.newHashSet(IP2));
        ecXHostStore.createOrUpdateHost(PID, HOSTID1, description1, false);

        Set<Host> hosts1 = ecXHostStore.getHosts(IP2);

        assertFalse(hosts1.size() < 1);
        assertTrue(hosts1.size() == 2);
    }

    @Test
    public void testRemoveHostByIp() {
        Set<IpAddress> ips = new HashSet<>();
        ips.add(IP1);
        ips.add(IP2);

        HostDescription description = createHostDesc(HOSTID, ips);
        ecXHostStore.createOrUpdateHost(PID, HOSTID, description, false);
        ecXHostStore.removeIp(HOSTID, IP1);
        Set<Host> hosts = ecXHostStore.getHosts(IP1);
        assertTrue(hosts.size() == 0);
    }

    @Test
    public void testHostOverride() {
        Host hostInStore;
        ecXHostStore.createOrUpdateHost(PID, HOSTID, HOST_LEARNT, false);
        hostInStore = ecXHostStore.getHost(HOSTID);
        assertFalse(hostInStore.configured());
        assertEquals(PID, hostInStore.providerId());

        // Expect: configured host should override learnt host
        ecXHostStore.createOrUpdateHost(PID2, HOSTID, HOST_CONFIGURED, true);
        hostInStore = ecXHostStore.getHost(HOSTID);
        assertTrue(hostInStore.configured());
        assertEquals(PID2, hostInStore.providerId());

        // Expect: learnt host should not override configured host
        ecXHostStore.createOrUpdateHost(PID, HOSTID, HOST_LEARNT, false);
        hostInStore = ecXHostStore.getHost(HOSTID);
        assertTrue(hostInStore.configured());
        assertEquals(PID2, hostInStore.providerId());
    }

    private static HostDescription createHostDesc(HostId hostId, Set<IpAddress> ips) {
        return createHostDesc(hostId, ips, false);
    }

    private static HostDescription createHostDesc(HostId hostId, Set<IpAddress> ips,
                                                  boolean configured) {
        return new DefaultHostDescription(hostId.mac(),
                hostId.vlanId(),
                HostLocation.NONE,
                ips,
                configured);
    }
}